CN104868959B - A kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method - Google Patents
A kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method Download PDFInfo
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- CN104868959B CN104868959B CN201410063996.0A CN201410063996A CN104868959B CN 104868959 B CN104868959 B CN 104868959B CN 201410063996 A CN201410063996 A CN 201410063996A CN 104868959 B CN104868959 B CN 104868959B
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Abstract
The invention belongs to fields of communication technology, disclose a kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method, the technical scheme is that：The signal received by antenna is after the filtering of pre-selection bounce frequency filter, low noise amplification, the 1st detection is carried out at radiofrequency signal end, then after being mixed, filtered with the 1st variable local oscillation signal, amplifying, the 2nd detection is carried out at the 1st intermediate frequency end, after being mixed, amplified with fixed 2nd local oscillation signal again, filtering, the 3rd detection is carried out at the 2nd intermediate frequency end；Terminal analysis compares the voltage value of 3 detections, determines whether interference signal, guidance originator transformation Hopping frequencies, avoid interference signal, filters out the detection voltage of useful signal, obtains the intensity for receiving channel field strength.The present invention improves the accuracy that band ultrashort wave frequency hopping receives the detection of channel field strength, can determine whether the appearance of interference signal, is conducive to the whole anti-interference ability for improving band ultrashort wave frequency-hopping system.
Description
Technical field
The present invention relates to a kind of method of reception channel field strength detection, especially a kind of ultrashort wave wide interval frequency hopping receives channel
Field strength detection method.
Background technology
Military wireless communication needs effectively and reliably to transmit information, for this reason, it may be necessary to titration data rate height, anti-interference energy
The strong telecommunication equipment of power, 30MHz~512MHz ultrashort wave Broadband high-speed datas radio station can be preferred.Ultrashort wave broadband high-speed
Data radio supports multiple-working mode, has stronger anti-interference ability, can be remote with higher rate under the mobile condition of battlefield
Distance Transmission information.Ultrashort wave wide interval frequency hopping receive channel operation principle be：The radiofrequency signal that antenna receives is through low noise
Amplifier amplifies, and is sent after frequency conversion once or twice to terminal and demodulates recovering signal.Since ultrashort wave frequency band frequency is relatively low, cover
Several octaves are covered, Testing of Feeble Signals difficulty is big after remote transmission, and broadband noise, spuious and interference signal are serious, influences
The detection accuracy and detection range of received signal level, also constrain the anti-interference ability and communication distance of system.
Invention content
The invention solves technical problems to be：A kind of ultrashort wave wide interval frequency hopping reception channel field strength detection method is provided, is carried
The high accuracy and detection range for receiving signal strength detection.
In order to solve the above technical problems, the present invention proposes a kind of ultrashort wave wide interval frequency hopping reception channel field strength detection side
Method places the detection of channel field strength respectively after RF preselection bounce frequency filter, the first intermediate-frequency filter, the second intermediate-frequency filter
Point；The number of second intermediate-frequency filter is the quantity of signal of communication, and each filter bandwidht of the second intermediate frequency is that corresponding communication is believed
Number bandwidth；The bandwidth of RF preselection bounce frequency filter is receive the Hopping frequencies that channel receives 20%, the suppression of the first intermediate frequency mirror image
The bandwidth of filter processed communicates signal bandwidth all the way equal to bandwidth is widest；It is specific as follows：
Step 1: antenna receives frequency hopping radiofrequency signal, RF preselection bounce frequency filter, RF preselection are output a signal to
After out-of-band interference and noise filtering that bounce frequency filter corresponds to bandwidth by the 20% of signal frequency, the first coupling is output a signal to
Signal is divided into main signal and coupled signal by device, the first coupler, and main signal is output to the first frequency mixer by the first coupler, will
First coupled signal is output to the first test point of field strength, and the corresponding voltage value of field strength is simultaneously output to by test point detection signal strength
Terminal data processing device；
Step 2: the first frequency mixer outputs a signal to the first intermediate-frequency filter by after signal frequency conversion to the first intermediate frequency, the
One intermediate-frequency filter by the Image interference of signal, harmonic wave, it is spuious filter out after, output a signal to the second coupler, the second coupling
Signal is divided into main signal and coupled signal by device, and main signal is output to the second frequency mixer by the second coupler, and coupled signal is defeated
Go out to the second test point of field strength, the corresponding voltage value of field strength is simultaneously output to terminal data processing by test point detection signal strength
Device；
Step 3: the second frequency mixer after signal frequency conversion to the second intermediate frequency, will output a signal to corresponding with signal
Two intermediate-frequency filters, the second intermediate-frequency filter determine the bandwidth of signal, and filter out band outside harmonic wave with it is spuious after, signal is exported
To third coupler, signal is divided into main signal and coupled signal by third coupler, and main signal is output to end by third coupler
Modem is held, coupled signal is output to field strength third test point, test point detection signal strength is simultaneously corresponding by field strength
Voltage value is output to terminal data processing device；
Step 4: the voltage value detected more three times, if third time detecting circuit value is less than second of detecting circuit value, and
Voltage value differs 0.2V or more twice, then terminal data processing device control transmitting terminal changes Frequency Hopping Signal frequency, retransmits letter
Number；Otherwise, third time detecting circuit value is to receive the corresponding voltage value of channel intensity level.
Beneficial effects of the present invention：
1, each voltage sense node places the contribution for reducing noise power in testing result after the filter,
Improve the sensitivity detected to inband signaling field strength and dynamic range.
2, double conversion is used, multiple detection nodes can be placed in the different location of receiving channel, improved to useful
The accuracy of signal strength detection, advantageously reduces influence of the out-of-band interference to testing result.
3, by can judge the intensity and frequency information of out-of-band interference signal the analysis of each nodal test result,
And in this, as the foundation of receiving channel gain control, improve the whole anti-interference ability of channel.
Description of the drawings
Fig. 1 is the fundamental diagram that a kind of ultrashort wave wide interval frequency hopping of the present invention receives the detection of channel field strength.
Specific implementation mode
The ultrashort wave wide interval frequency hopping of the present invention receives channel field strength detection method, as shown in Figure 1, in RF preselection frequency hopping
Channel field strength test point is placed after filter, the first intermediate-frequency filter, the second intermediate-frequency filter respectively.
The number of second intermediate-frequency filter is the quantity of signal of communication, and each filter bandwidht of the second intermediate frequency is corresponding logical
Believe signal bandwidth.Signal of communication there are many receiving in channel, for example, voice signal, data-signal, picture signal, so different
Signal corresponding second intermediate-frequency filter can be set, than if any voice signal filter, data-signal filter, picture signal
Filter.
The bandwidth of RF preselection bounce frequency filter is receive the Hopping frequencies that channel receives 20%, the suppression of the first intermediate frequency mirror image
The bandwidth of filter processed is equal to that bandwidth is widest to communicate signal bandwidth all the way, for example the bandwidth of picture signal is most wide, so first
The bandwidth selection of intermediate frequency image-reject filter is consistent with vision bandwidth.It is specific as follows：
Step 1: antenna receives frequency hopping radiofrequency signal, RF preselection bounce frequency filter, RF preselection are output a signal to
After out-of-band interference and noise filtering that bounce frequency filter corresponds to bandwidth by the 20% of signal frequency, the first coupling is output a signal to
Signal is divided into main signal and coupled signal by device, the first coupler, and main signal is output to the first frequency mixer by the first coupler, will
Coupled signal is output to the first test point of field strength, and the corresponding voltage value of field strength is simultaneously output to terminal by test point detection signal strength
Data processor；
Step 2: the first frequency mixer outputs a signal to the first intermediate-frequency filter by after signal frequency conversion to the first intermediate frequency, the
One intermediate-frequency filter by the Image interference of signal, harmonic wave, it is spuious filter out after, output a signal to the second coupler, the second coupling
Signal is divided into main signal and coupled signal by device, and main signal is output to the second frequency mixer by the second coupler, and coupled signal is defeated
Go out to the second test point of field strength, the corresponding voltage value of field strength is simultaneously output to terminal data processing by test point detection signal strength
Device；
Step 3: the second frequency mixer after signal frequency conversion to the second intermediate frequency, will output a signal to corresponding with signal
Two intermediate-frequency filters, the second intermediate-frequency filter determine the bandwidth of signal, and filter out band outside harmonic wave with it is spuious after, signal is exported
To third coupler, signal is divided into main signal and coupled signal by third coupler, and main signal is output to end by third coupler
Modem is held, coupled signal is output to field strength third test point, test point detection signal strength is simultaneously corresponding by field strength
Voltage value is output to terminal data processing device；
Step 4: the voltage value that terminal data processing device detects more three times, if third time detecting circuit value is less than second
Secondary detecting circuit value, and voltage value differs 0.2V or more twice, illustrates there is interference outside signal bandwidth；Terminal data processing device control
Transmitting terminal processed changes Frequency Hopping Signal frequency, signal is retransmitted, to avoid interference；Otherwise, third time detecting circuit value is to connect
The corresponding voltage value of collection of letters road intensity level.
Claims (1)
1. a kind of ultrashort wave wide interval frequency hopping receives channel field strength detection method, it is characterised in that：
Place the inspection of channel field strength respectively after RF preselection bounce frequency filter, the first intermediate-frequency filter, the second intermediate-frequency filter
Measuring point；The number of second intermediate-frequency filter is the quantity of signal of communication, and each filter bandwidht of the second intermediate frequency is corresponding communication
Signal bandwidth；The bandwidth of RF preselection bounce frequency filter is receive the Hopping frequencies that channel receives 20%, the first intermediate frequency mirror image
The bandwidth of rejects trap communicates signal bandwidth all the way equal to bandwidth is widest；It is specific as follows：
Step 1: antenna receives frequency hopping radiofrequency signal, RF preselection bounce frequency filter, RF preselection frequency hopping are output a signal to
After out-of-band interference and noise filtering that filter corresponds to bandwidth by the 20% of signal frequency, the first coupler is output a signal to,
Signal is divided into main signal and coupled signal by the first coupler, and main signal is output to the first frequency mixer by the first coupler, by
One coupled signal is output to the first test point of field strength, and the first test point detects channel field strength and exports the corresponding voltage value of field strength
To terminal data processing device；
Step 2: the first frequency mixer after signal frequency conversion to the first intermediate frequency, will output a signal to the first intermediate-frequency filter, in first
Frequency filter by the Image interference of signal, harmonic wave, it is spuious filter out after, output a signal to the second coupler, the second coupler will
Signal is divided into main signal and coupled signal, and main signal is output to the second frequency mixer, coupled signal is output to by the second coupler
The corresponding voltage value of field strength is simultaneously output to terminal data processing by the second test point of field strength, the second test point detection channel field strength
Device；
Step 3: the second frequency mixer is output a signal to after signal frequency conversion to the second intermediate frequency in corresponding with signal second
Frequency filter, the second intermediate-frequency filter determine the bandwidth of signal, and filter out the harmonic wave outside band with it is spuious after, output a signal to the
Signal is divided into main signal and coupled signal by three couplers, third coupler, and main signal is output to terminal tune by third coupler
Coupled signal is output to field strength third test point by modulator-demodulator, and third test point detection channel field strength is simultaneously corresponding by field strength
Voltage value is output to terminal data processing device；
Step 4: the voltage value detected more three times, if third time detecting circuit value is less than second of detecting circuit value, and twice
Voltage value differs 0.2V or more, then terminal data processing device control transmitting terminal changes Frequency Hopping Signal frequency, retransmits signal；It is no
Then, third time detecting circuit value is to receive the corresponding voltage value of channel intensity level.
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| CN1759535A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Automatic gain control with two power detectors |
| CN1777073A (en) * | 2004-11-15 | 2006-05-24 | 中兴通讯股份有限公司 | Device for realizing multi-carrier receiving signal strength indication |
| CN101953067A (en) * | 2007-10-10 | 2011-01-19 | 迈凌有限公司 | Gain partitioning in a receiver |
| CN102324946A (en) * | 2011-06-10 | 2012-01-18 | 武汉理工大学 | The high intermediate frequency front-end circuit of numerical control short-wave receiver |
| US8180308B1 (en) * | 2008-06-10 | 2012-05-15 | Marvell International Ltd. | Apparatus and methods for detection of interface in radio-frequency devices |
| CN203057121U (en) * | 2012-12-25 | 2013-07-10 | 陕西烽火电子股份有限公司 | AGC circuit quick control system based on linear receiver |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1759535A (en) * | 2003-03-12 | 2006-04-12 | 皇家飞利浦电子股份有限公司 | Automatic gain control with two power detectors |
| CN1777073A (en) * | 2004-11-15 | 2006-05-24 | 中兴通讯股份有限公司 | Device for realizing multi-carrier receiving signal strength indication |
| CN101953067A (en) * | 2007-10-10 | 2011-01-19 | 迈凌有限公司 | Gain partitioning in a receiver |
| US8180308B1 (en) * | 2008-06-10 | 2012-05-15 | Marvell International Ltd. | Apparatus and methods for detection of interface in radio-frequency devices |
| CN102324946A (en) * | 2011-06-10 | 2012-01-18 | 武汉理工大学 | The high intermediate frequency front-end circuit of numerical control short-wave receiver |
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